An Anniversary in Japan (futa/m/m/m/f/f/f)

This is a continuation of my previous story The Errand.

I've been dating Heather for a bit more than a year now. Heather is quite a special girl, as you may have read from my previous stories. She is gorgeous, with a perfect slender body, unusually large breasts, well-shaped slender legs, and the unusual distinction of having a penis. And testicles. And not just any penis and testicles, but penis and testicles of an astounding size, something no male could approach. I'm aware of how unusual this is, and I feel thankful for it every single day I'm with her, and every second that I am pleasuring her.

After our initial lust-filled encounters, we started dating regularly, and each day was like a new adventure. We sometimes settled into sexual routines, but I never really could get used to the size of her penis and balls. They were so far out of the bounds of normality, that the my brain couldn't accurately remember what they were like. Every time we had sex it was still like an amazing discovery as I explored her body all over again. Our routines were puncuated by little trends we got on, where she would dominate me and force me worship her, just slowly licking, sucking and fondling her equipment while she would do some homework. Or I would dominate her, or we would invite our occasional fuck-buddy Amy over for a three-some. It was an amazing year.

For our year anniversary, we decided to take a trip together. We went to Japan, where Heather had spent some time. Heather planned the trip, and promised me something special on the date of our anniversary.

We arrived on a Monday, and were going to spend a week and a half there. Heather knew her way around fairly well, and spoke decent Japanese. I let her do everything, and I just saw, took pictures, ate, carried luggage, etc. We had some amazing food, and went to some really cool places, from ancient temples to little Karaoke joints.

One thing was odd. Heather refused to have sex. When I started making out with her, we would kiss for a while, but eventually she would pull away, saying that she's saving that up for our anniversary date. I figured she was saving up her cum. Last time that happened, she didn't come for two weeks, and when I saw her, her balls were much larger than normal. And her balls are normally gigantic. But we'd spend the nights watching crazy Japanese TV, or often she spent time huddled over her laptop. I asked her what she was doing, but she didn't say.

As the date of our anniversary approached, we both were growing increasingly horny. I could see that she was too, her eyes were glazed with lust every night, and she hesitated before pulling away when we kissed. When we woke up in bed together, her cock was always hard and softly pulsing between us. If I tried to lick it, she would just sigh and pull away. I wanted us to have sex so bad,